FLOWVALVE LLC manufactures and sells high-quality pressure pipe unions and related oilfield control products. Flowvalve’s CNC ... manufacturing facility is located in Sulphur, Oklahoma, and covers over 200,000 square feet with over 200 CNC machines under roof. At FlowValve, employees share a common commitment to the quality of our products. All of our products are 100% manufactured and certified in the U.S.A., with complete traceability. read more